Furthermore for some of the integral families, individual propagators are raised
to positive and negative powers up to 12,
which constitute a non-trivial task for the IBP reduction programs.
The latter could be handled thanks to a private version of FIRE [1]}
combined with LiteRed [2]}.
For the subset of integrals which are needed for the expansion up to \(\delta ^{10}\)  we also
use the stand-alone version of LiteRed as a cross-check.
